Calling Guam from Costa Rica: 00 1-671 [local number].
Quick answer
To call Guam from Costa Rica, dial 00, then 1-671, then the local number without leading zeros. Example: 00 1-671 +1 671 300 1234.
Plan before you dial with the international call cost calculator and the best time to call planner. Looking for a calling card alternative instead of the dialing instructions? Compare calling cards to Guam.
Dialing format
00 1-671 +1 671 300 1234
Exit code • Country code • Local number
Whether you’re calling family, friends, or business contacts, knowing how to call Guam correctly helps your conversation start smoothly. This guide covers the essential dialing steps, including country and area codes that are easy to miss. By the end, you’ll be ready to connect confidently with anyone in Guam - whether you’re calling Hagåtña or anywhere else.
Follow these simple steps to make a call to Guam from Costa Rica
Start by dialing 00 (or use + on mobile). This is the international dialing prefix for Costa Rica.
Dial the country code +1-671 for Guam.
Dial the local phone number in Guam (typically 8-10 digits, without any leading zeros).
Full format: 00 1-671 [local number] - For example: 00 1-671 612 345 678
International Dialing Format
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Calling Code
+1-671
Capital of Guam
Hagåtña
Region
Oceania (Micronesia)
Currency of Guam
United States dollar ($)
Guam Time Zones
UTC+10:00
Current time
Your time
--:--
Guam
--:--
Guam is --
Guam, located in Micronesia, is a nation with a rich identity. Its capital city, Hagåtña, serves as the administrative center for a population of approximately 154K.
The official currency is the United States dollar ($). When calling Guam, the country code is +1-671. The country observes the UTC+10:00 time zone(s), and the primary language(s) spoken include Chamorro, English, Spanish.
Population
154K
Population Rank
#185 of 230
Language Footprint
Chamorro, English, Spanish
Time Zone Footprint
UTC+10:00
City/Area Code Coverage
No city-level entries yet
Dial Code Status
Exclusive code in dataset
Guam currently has a 10-digit local number pattern in this guide, with country code +1-671.
Exit Code in Costa Rica
00 (dial 00 (or + from mobile))
Costa Rica Country Code
+506
Route Dialing Pattern
00 1-671 +1 671 300 1234
Capital Time Difference
16h destination ahead
Best Calling Window (Origin Time)
17:00-23:59 and 00:00-02:00
Currency Pair
Costa Rican colón (₡) -> United States dollar ($)
Primary languages: Costa Rica (Spanish) and Guam (Chamorro, English, Spanish).
Shared language overlap: Spanish. Primary timezones: Costa Rica (UTC-06:00) and Guam (UTC+10:00).
Use this route profile to plan a real call from Costa Rica to Guam, including the exit code, destination country code, time difference, and local context.
From
Costa Rica
To
Guam
For dialing this route, callers in Costa Rica usually start with 00 or the plus sign, then dial +1-671 before the local Guam number.
Costa Rica's primary timezone in this dataset is UTC-06:00, while Guam's is UTC+10:00. A practical origin-time calling window is 17:00-23:59 or 00:00-02:00.
Costa Rica callers are represented by CR/CRI, with San José as a capital reference point, Central America, 5.3M people, Costa Rican colón (₡), and primary language context of Spanish.
Origin exit prefix: 00 or + from mobile. Origin country code: +506. Origin time zones: UTC-06:00.
Guam is represented here by GU/GUM, Hagåtña, Micronesia, about 154K people, United States dollar ($), and primary language context of Chamorro, English, Spanish.
Destination calling code: +1-671. Destination time zones: UTC+10:00. Rate check: check live price before dialing.
This route combines Costa Rica's outbound dialing rules with Guam's destination numbering and local schedule. The primary timezone relationship is 16h destination ahead, and the recommended origin-time window is 17:00-23:59 or 00:00-02:00.
Dialing sequence: 00 1-671 local number. Business-hour window: 17:00-23:59 or 00:00-02:00. Time relationship: 16h destination ahead.
Destination market: Guam is in Micronesia, with Hagåtña as a main administrative center. Calls from Costa Rica may reach family, companies, banks, hotels, clinics, or public offices across a market of about 154K. Primary language context: Chamorro, English, Spanish. Local billing and everyday prices use United States dollar ($).
Route context: Costa Rica is listed in Central America with a population of about 5.3M; Guam is listed in Micronesia with about 154K. The route has shared language overlap in Spanish. Currency context also changes across the route: Costa Rican colón (₡) in Costa Rica and United States dollar ($) in Guam.
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